Turn knob



FIG. 1 is side, perspective view of the turn knob according to the design of the present invention;

FIG. 2 is a front, elevational view of the turn knob shown in FIG. 1;

FIG. 3 is a rear, elevational view of the turn knob shown in FIG. 1;

FIG. 4 is a right side, elevational view of the turn knob shown in FIG. 1, with the left side view being a mirror image thereof;

FIG. 5 is a top, plan view of the turn knob shown in FIG. 1; and,

FIG. 6 is bottom , plan view of the turn knob shown in FIG. 1.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a turn knob, as shown and described. 